The first interruption of the Jets' sunny mood is the sharply punctuated entrance of the leader of the Sharks, Bernardo: handsome, proud, fluid, a chip on his sardonic shoulder.
developed or executed with care and in minute detail
The beginnings of warfare are mild at first: a boy being tripped up, or being sandbagged with a flour sack or even being spit on—all with overly elaborate apologies.
(used especially of clothes) marked by conspicuous display
Anita, a Puerto Rican girl with loose hair and slightly flashy clothes, is finishing remaking what was a white communion dress into a party dress for an extremely lovely, extremely young girl: Maria.
They have been cheering on their respective friends, clapping in rhythm. Now, as they see each other, their voices die, their smiles fade, their hands slowly go to their sides.