Noun
(education, abacus jargon) A natural number which when added to another number equals 5.
Synonym: small friend
The little friend of 2 is 3 because 2 + 3 = 5.
Used other than figuratively or idiomatically: see little, friend.
Source: en.wiktionary.orgI'm reading more than ever. I used to find it tedious, but now it's like my little friend - it takes my mind off things. Billie Piper
The Little Friend is a long book. It's also completely different from my first novel: different landscape, different characters, different use of language and diction, different approach to story. Donna Tartt
Knowledge is a thing that one cannot have enough of. It is the fruit of wisdom, to be eaten carefully and digested fully, unlike that lunch you are bolting down, little friend. Brian Jacques
If you're in a Gay Mafia and you get whacked, is that good or bad? [gay voice] Say hello to my little friend. Larry the Cable Guy
There are two young Englishmen in the next rooms to ours who are superb; their two sisters, looking like umbrellas, are here too, dressed in pink, with a little friend in blue with red hair. She is a type I have tried to draw on horseback but have not succeeded. Henri de Toulouse-Lautrec