buckle up
idiomTo fasten one's seat belt or safety belt.
- 01
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.
- 02
buckle to
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”).