1. 倾全力,开始认真从事：21buckle down 倾全力,开始认真从事 | build into 使固定于,开始认真从事 | They built loose stones into a strong wall.他们用石块建成坚固的墙.

2. 集中精神于(某事(全体)认真干,全力以赴：76. brush up刷干净,刷亮,温习 | 77. buckle down集中精神于(某事(全体)认真干,全力以赴 | 78. buck up(使)精神振奋;赶快

verb

1. work very hard, like a slave

Synonym: slavebreak one's backknuckle down