| a fool or simpleton; ninny. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| fill in | |
| —vb | |
| 1. | (tr) to complete (a form, drawing, etc) |
| 2. | (intr) to act as a substitute: a girl is filling in while the typist is away |
| 3. | (tr) to put material into (a hole or cavity), esp so as to make it level with a surface |
| 4. | informal (tr) to inform with facts or news |
| 5. | slang (Brit) (tr) to attack and injure severely |
| —n | |
| 6. | a substitute |
| 7. | informal (US) a briefing to complete one's understanding |
fill in
Complete something, especially by supplying more information or detail. For example, Be sure to fill in your salary history. It is also put as , as in We'll rely on Mary to fill in the blanks. Yet another related usage is fill someone in, as in I couldn't attend, so will you fill me in? The first term dates from the mid-1800s; the others from the first half of the 1900s. Also see fill out.
Also, fill in for. Take someone's place, substitute for. For example, The understudy had to fill in at the last minute, or I can't come but my wife will fill in for me. Also see fill someone's shoes.