to make one's way into; to push one's way into; to force one's way though; to push through
探検家はジャングルを分け入った。
The explorer pushed his way into the jungle.
救助隊は竹藪を分け入って、遭難者を見つけた。
The rescue team pushed through the bamboo thicket and found the stranded hiker.
研究者たちは毎年、深い森を分け入る。
Researchers push their way into the deep forest every year.