cudgel
Concise Oxford English Dictionary © 2008 Oxford University Press:
cudgel /ˈkʌdʒ(ə)l/
▶noun a short, thick stick used as a weapon. ▶verb (cudgels, cudgelling, cudgelled; US cudgels, cudgeling, cudgeled) beat with a cudgel.
– phrases
cudgel one's brain Brit. think hard about a problem.
take up cudgels start to defend or support someone or something strongly.
cudgel one's brain Brit. think hard about a problem.
take up cudgels start to defend or support someone or something strongly.
– origin OE cycgel, of unknown origin.
'cudgel' also found in these Oxford entries:

