to explore; to search out; to scout; to seek or investigate

(bound form) a person who gathers intelligence or investigates; a spy; a detective

to visit; to call on; to see someone to check on their well-being

to scout; to spy; to reconnoiter; to surreptitiously investigate

to test; to sound out; to probe (someone's opinion, water temperature, etc.)

to stretch or pop forward; to crane one's neck or lean out

to reach into with the hand to feel for or fetch something

(literary) to test; to try; to put one's hand into something to test it