back of one's hand

Known without looking

The back of one's hand is the outer surface opposite the palm—the side you see when making a fist.

To know something like the back of one's hand is to know it thoroughly, from constant familiarity: I know these streets like the back of my hand.

A backhand blow strikes with this surface rather than the palm.

Related

backhanded compliment · proprioception · familiarity · contempt · rejection · mastery · disdain · slap in the face · wrist · recognition · indifference · phrase · snub · cold shoulder · expertise · skin · skin deep · tendons

Opposites
hand anatomy

back of one's handpalm

Hand's flat interior

familiarity idiom

back of one's handunknown quantity

Undetermined value or factor

terra incognita · mystery · uncharted waters · blind spot · stranger

gesture and social meaning

back of one's handhandshake

Mutual palm-gripping gesture

caress · pat on the back · gentle touch · open palm · embrace

Family

back, backs, backed, backing, backer, backmost, ones, hand, hands

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G