Verb (5-dan, る, intransitive)
1. to enter; to go in; to get in; to come in
mainly used in fixed expressions and literary language
二人は警戒しながら中に踏み入る。The two step inside while remaining on guard.
2. to set (of the sun or moon); to sink; to go down
3. to attain (nirvana, enlightenment, etc.); to achieve; to reach (e.g. a climax)
4. to do fully; to do intently; to do sincerely; to do deeply; to feel keenly
after -masu stem of verb
彼は窓の外の景色にしばし眺め入った。He gazed intently at the scenery outside the window for a while.
5. to (reach a state) completely
after -masu stem of verb