Fetching details from the dictionary...

to stuff into; to jam; to cram; to pack; to fill; to plug; to stop up
to shorten; to move closer together
to reduce (spending); to conserve
to focus intently on; to strain oneself to do
to go through thoroughly; to work out (details); to bring to a conclusion; to wind up
to be on duty; to be stationed
to corner (esp. an opponent's king in shogi); to trap; to checkmate
to cut off (one's finger as an act of apology); to catch (one's finger in a door, etc.)
to do non-stop; to do continuously; to keep doing (without a break)
to do completely; to do thoroughly
to force someone into a difficult situation by ...
荷物をスーツケースに詰めた。
I packed luggage into the suitcase.
二人の距離を詰める努力をする。
Make an effort to close the distance between the two.
母が弁当箱に美味しいご飯を詰めた。
Mom packed delicious rice into the lunch box.