1) (the sound of) people talking quickly and informally together (chatter)
2) trousers (usually made of blue demin) worn informally (jeans)
3) trousers, not part of a suit, worn informally (slacks)
4) a short-sleeved, cotton shirt like a vest, worn informally (t-shirt)
because of the ability from birth; of course; as might be expected; without artificial help
as anticipated
