SWIG

noun

1. Drink, liquor.
2. (by extension) A long draught from a drink.
3. A person who drinks deeply.

verb

1. To drink (usually by gulping or in a greedy or unrefined manner); to quaff.
2. To suck.
3. To take up the last bit of slack in rigging by taking a single turn around a cleat, then hauling on the line above and below the cleat while keeping tension on the line.