PUMP can be signed many ways, depending on what objects are. Here is a few examples.
Meaning: a machine or device that is used to force a liquid or gas to flow in a particular direction.
Meaning air pump for bicycle tire.
Meaning: an old-fashioned water pump.
Meaning: to pump a spraying container.
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ASL has its own grammar and structure in sentences that works differently from English. For plurals, verb inflections, word order, etc., learn grammar in the "ASL Learn" section. For search in the dictionary, use the present-time verbs and base words. If you look for "said", look up the word "say". Likewise, if you look for an adjective word, try the noun or vice versa. E.g. The ASL signs for French and France are the same. If you look for a plural word, use a singular word.