Original glyph (㚒) infers two of something entering or inserted with one on each side. To PRESS ON BOTH SIDES, INTERSPERSE, MIX, MINGLING together (see 交). An element meaning「coming, approaching, caused by, be due to, about to come」doing some SQUEEZING, PRESSING FROM EACH SIDE, CLAMPING on a wedge tool.
Refers to something being WEDGED, or using something as a WEDGE. As some contributors have pointed out, a big person between two much smaller people will likely not be squeezed by the smaller persons, nor will the big person squeeze those on both sides simultaneously since they can easily move away if need be. The「big」element is comprised of「hand taut」but in the case of this glyph, perhaps one「arm」draped over each of「two [other] persons」meaning CLAMPED and SQUEEZED, something wedged inside armpits, or perhaps a「taut erect rod」in hand assuming its「biggest」shape.
Although somewhat doubtful, some others have suggested this glyph has morphed from an extremely ancient meaning first designed far into antiquity, that of a fat or large person wedged between other normal-sized passengers in the middle seat of the economy section in an aircraft.
Modern glyph (夹) of「adult male emissions」or「two-handed big spurting」or「two physical states flaming in heat」or「two people emitting」and so on as TWO LAYERED or INSERTED BETWEEN.
In China, concubine dresses were most often sleeveless…and now you know why. Original glyph (㚒) refers to two [of something] entering, inserted from both sides, with one Chinese listed meaning of PLACING SOMETHING IN OR UNDER ONE'S ARMPITS, an armpit fetishism known as MASCHALAGNIA, and AXILLISM (masturbating with an armpit). Also meaning CLAMPED, and SQUEEZED on each side, so you must ask yourself, what are these three people doing to arrive at the meanings of SQUEEZED, PRESSED FROM or ON BOTH SIDES, CLAMPED…WEDGED? and what is happening, in light of other Chinese meanings of INTERSPERSE, MIX, MINGLING (see 交)? people still do this today, you know…
Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
[ https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31 ]
The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
[ https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16 ]
Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: Taiwan pr. used in 夾生|夹生 and 夾竹桃|夹竹桃; double-layered; lined (garment); to press from either side; to place in between; to sandwich; to carry sth under armpit; wedged between; between; to intersperse; to mix; to mingle; clip; folder
Japanese EDRDG: insert between
Unihan extended: be wedged or inserted between