to pin; to fasten
To pin a badge on one's hat
To fasten one's jacket with buttons; to button one's jacket
Door closed and bolt fastened
to lay; to set
To lay a trap; to set a trap
To set a mine trap; to mine
to infiltrate; to plant
To unmask spies planted by the enemy
To plant one's own men in the key positions in the enemy ranks; To infiltrate one's own men into the key positions in the enemy ranks