figurative (of persons and things). To advance or come on slowly, stealthily, or by imperceptible degrees; to insinuate oneself into; to come in or up…

Of things. To insinuate itself, find acceptance in disguise. Also, to gain influence by imperceptible degrees. Const. on. Obsolete.

figurative. intransitive. With into. To penetrate in a way that is similar to the action of a screw; to insinuate oneself into. Obsolete.

figurative. To make one's way insidiously like a worm into (a person's confidence, secret affairs, etc.); to burrow in so as to hurt or destroy…

figurative. To make way in a stealthy or insidious manner. Also transitive in to sap one's way.

To extricate oneself from or get out of a place in the manner of a weasel. Also with in (with movement in the opposite direction).