Wiktionary
tug boat
n. (alternative form of tugboat English)
Usage examples of "tug boat".
And as the lines were cast off they made a running jump on to the deck of the tug boat, and the vessel backed out into the stream.
In forty-five more days, USS Maine would surface outside Juan de Fuca Straits, link up with the tug boat, and follow Little Toot into Bangor, where she would then tie up and begin the hand-off process to the 'Blue' crew for the next deterrence-patrol cycle.
She guided the older woman to a chair at the tablea tug boat steering a linerand helped her into it.