exchange (messages, greetings, etc.) / to do with each other (promise, handshake, etc.) / cross, intersect

with each other, with one another

exchanging significant looks, winking

exchange significant looks, wink, make signs with the eyes

(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

secret

secret

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend