磕頭如搗蒜

1. • lit. to kowtow like grinding garlic (idiom)
2. • fig. to pound the ground with one's head

Character by character

• 磕(kè)tap
• 頭(tóu)head
• 如(rú)as
• 搗(dǎo)pound
• 蒜(suàn)garlic