full belt en · ADV
Meanings
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(not-comparable) Very quickly; at maximum speed.
‘By cripes, not if I can help it!’ said Egbert and began to run after Murial Jane who went into the bushes at a trot, and then full-belt into a canter, with Egbert close on her heels.
1936, Norman Lindsay, The Flyaway Highway, Sydney: Angus and Robertson, page 105: