Godan verb with 'mu' ending, Transitive verb
to screw in
彼は手紙をポケットにねじ込んだ。He shoved the letter into his pocket. to thrust into; to push into; to shove into; to squeeze in (e.g. a meeting)
Godan verb with 'mu' ending, Intransitive verb
to protest (and seek rectification); to complain
Also written 捻じ込む【ねじこむ】、捩じ込む【ねじこむ】