back(adverb)

to, or at, the place or person from which a person or thing came

I went back to the shop; He gave the car back to its owner.

back(noun)

in man, the part of the body from the neck to the bottom of the spine

She lay on her back.

back(verb)

to (cause to) move backwards

He backed (his car) out of the garage.

back(adverb)

away (from something); not near (something)

Move back! Let the ambulance get to the injured man; Keep back from me or I'll hit you!

back(noun)

in animals, the upper part of the body

She put the saddle on the horse's back.

back(verb)

to help or support

Will you back me against the others?

back(adverb)

towards the back (of something)

Sit back in your chair.

back(noun)

that part of anything opposite to or furthest from the front

the back of the house; She sat at the back of the hall.

back(verb)

to bet or gamble on

I backed your horse to win.

back(adjective)

of or at the back

the back door.

back(adverb)

in return; in response to

When the teacher is scolding you, don't answer back.

back(noun)

in football, hockey etc a player who plays behind the forwards.

back(adverb)

to, or in, the past

Think back to your childhood.