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knuckle

1 knuckle /ˈnʌkəl/ noun
plural knuckles
1 knuckle
/ˈnʌkəl/
noun
plural knuckles
Britannica Dictionary definition of KNUCKLE
[count]
: any one of the thick, bony parts (called joints) in your fingers see picture at hand
: a piece of meat that includes a joint from the leg of an animal

a rap on/over/across the knuckles

see 1rap

rap (someone) on/over/across the knuckles

see 2rap
2 knuckle /ˈnʌkəl/ verb
knuckles; knuckled; knuckling
2 knuckle
/ˈnʌkəl/
verb
knuckles; knuckled; knuckling
Britannica Dictionary definition of KNUCKLE

knuckle down

[phrasal verb] informal
: to begin to work hard often + to

knuckle under

[phrasal verb] informal
: to stop trying to fight or resist something : to agree to do or accept something that you have been resisting or opposing
often + to