~ 1
(also ~ whiz )
■ exclamation informal, chiefly N. Amer. a mild expression of surprise, enthusiasm, or sympathy.
Origin
C19: perh. an abbrev. of Jesus .
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~ 2
■ exclamation ( ~ up ) a command to a horse to go faster.
■ verb ( ~s , ~ing , ~d ) ( ~ someone/thing up ) Brit. command a horse to go faster.
↘encourage someone to work more quickly.
Origin
C17: of unknown origin.