rear

1 rear /ˈriɚ/ noun
plural rears
1 rear
/ˈriɚ/
noun
plural rears
Britannica Dictionary definition of REAR
1 
[noncount] : the part of something that is opposite to or away from the front part : the back part of something — often + of
2 
[count] informal : the part of your body that you sit on : buttocks — usually singular

bring up the rear

: to be in the last position in a group, line, etc.
2 rear /ˈriɚ/ adjective
2 rear
/ˈriɚ/
adjective
Britannica Dictionary definition of REAR
always used before a noun
: at or near the back of something
3 rear /ˈriɚ/ verb
rears; reared; rearing
3 rear
/ˈriɚ/
verb
rears; reared; rearing
Britannica Dictionary definition of REAR
1 
[+ object] : to take care of (a young person or animal)
— often + on
2 
[no object] of an animal : to rise up on the back legs with the front legs in the air
3 
[no object] : to rise high in the air

rear its ugly head

— see 1head