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| a stew of meat, vegetables, potatoes, etc. |
| a chattering or flighty, light-headed person. |
"The Hebrews divided the night into three watches, the Greeks usually into four (sometimes five), the Romans (followed by the Jews in New Testament times) into four." [OED]The meaning "small timepiece" is from 1588, developing from that of "a clock to wake up sleepers" (1440). Watchmaker is recorded from 1630; watchtower is attested from 1544.
watch over
Guard for protection or safekeeping, as in There were only two aides watching over that large group of children. This idiom was first recorded in 1526.