to have a share or part; take part (often followed by in).
6.
to divide, apportion, or receive equally.
Idiom
7.
on/upon shares, on the principle of sharing the profits or losses of an undertaking: They agreed to work on shares.
Origin: 1325–75; Middle English (noun) cutting, division; Old English scearu fork of the body, groin; cognate with Dutch schaar,German Schar troop. See shear
Synonyms 1. allotment, allocation; contribution, assessment; quota, lot. 3. allot, parcel out, deal out, dole, mete. 5.Share,partake,participate mean to join with others or to receive in common with others. To share is to give or receive a part of something, or to enjoy or assume something in common: to share in another's experiences. To partake is to take for one's own personal use a portion of something: to partake of food. To participate is especially to join with others in some thought, feeling, or, particularly, some action: to participate in a race, in a conversation.