infiltrate

1. (verb) pass through an enemy-line; in a military conflict
Synonyms: pass through
Related Words: go across, go through, pass

2. (verb) cause (a liquid) to enter by penetrating the interstices
Related Words: filter, percolate, permeate, sink in

3. (verb) join a group in order to spy on the members
Related Words: fall in, get together, join



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