An old saw; an ancient proverbial saying.
a term at whist. A saw  is established when two partners alternately trump a suit, played to each other for the express purpose.
Saw, Seen, See.—“I see him last Monday.” Say “I saw him.” “I seen him yesterday.” Say “I saw him.” “I haven't saw him for along time.” Say “I haven't seen him.” See is present, saw  imperfect, seen  the participle. The habit of confusing them prevails widely.

saw , seen : In popular use, in some regions, often carelessly and inexcusably interchanged. Saw is the imperfect tense of see and to be used as such only; seen is its past participle, and the form to be used, with the proper auxiliaries, in the tenses formed with the aid of the past participle. Not “I seen him,” but “I saw him”; not “I have (or had) never saw it,” but “I have (or had) never seen it.”

n. A trite popular saying, or proverb. (Figurative and colloquial.) So called because it makes its way into a wooden head. Following are examples of old saws fitted with new teeth.

      A penny saved is a penny to squander.

      A man is known by the company that he organizes.

      A bad workman quarrels with the man who calls him that.

      A bird in the hand is worth what it will bring.

      Better late than before anybody has invited you.

      Example is better than following it.

      Half a loaf is better than a whole one if there is much else.

      Think twice before you speak to a friend in need.

      What is worth doing is worth the trouble of asking somebody to do it.

      Least said is soonest disavowed.

      He laughs best who laughs least.

      Speak of the Devil and he will hear about it.

      Of two evils choose to be the least.

      Strike while your employer has a big contract.

      Where there's a will there's a won't.