crowded, mixture, in bulk, included, (kokuji)
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込 centers on things being packed together or included: a crowd, a mixture, or something added in bulk. The idea is always about putting things into a space or group so they become dense or part of a whole.
to be crowded; to be packed; to be congested; to be thronged (with)
to load (a gun, etc.); to charge
writing
hope; promise; possibility; chance; probability; likelihood
including tax (of a price); pretax (income or profits); before tax
application; entry; request; subscription; offer; proposal; overture; challenge
bring-your-own (e.g. food and drink); carry-on (e.g. luggage)
to thrust (something) into (something); to cram; to stuff; to shove
to bring in; to take in; to carry in
payment made via bank deposit transfer
training; education; upbringing
taking in; bringing in
to board (a train, plane, etc.); to get into (a car); to get on (a bus); to go on board; to get aboard
to feel down; to feel sad; to be depressed; to be in low spirits
jump; plunge; dive
to roll up; to enfold; to swallow up
to take in; to bring in; to adopt (e.g. behaviour); to introduce
to go into; to come into; to penetrate; to get in; to step in (a house)
to herd; to drive; to chase; to corral
to jump in; to leap in; to plunge into; to dive
final stage; final stretch; final spurt; last spurt; final push; late charge
to fill in (field, entry, etc.); to fill out (form)
to apply for; to make an application; to propose (marriage); to offer (mediation); to make an overture (of peace); to challenge; to lodge (objections); to request (an interview); to subscribe for; to book; to reserve
to send in
込 is a Japanese kokuji (国字) created by combining the movement radical 辶 with 入 (enter). It expresses the idea of entering and filling a space, leading to meanings like crowded or included.
The movement radical 辶 suggests going, and 入 means enter. Picture people entering a room until it becomes crowded and everything is mixed together in bulk.
For -こ, imagine a crowded room where everyone is saying 'ko' as they bump into each other: 'ko, ko, ko!' The sound of the crowd cues こ.