Buckle to

verb, slang

Definitions

Verb
  1. 1
    Synonym of buckle down (“to apply oneself to study, or a task or work; to focus on or take a serious attitude towards something; to put forth the needed effort”). idiomatic, informal, intransitive

    "Then the sergeant let us out, and introducing us to a pile of wood and saws and axes, informed us that when this had been cut up into firewood we should get our breakfast. He sat at the door of his kitchen watching, and seeing there was nothing else for it we buckled to and soon had the job done; when we were admitted to the kitchen and given a really good meal."

Etymology

From buckle + to.

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