back; behind; other side / inside / reverse side of a coin ("tails") / (baseball) bottom (of an inning)

back channel

to go through, to pass

a road or path, (often) a highway / a course, an itinerary of stops, as for a bus / a path or course for information / a path or course for goods in a transaction / (video games, storytelling) storyline

(mathematics) a root (as in a square root) / (linguistics) an etymological root / (music) root note in a chord

secret

secret

information / news / gossip

to send; to dispatch / to see off, to take (somebody somewhere), to escort / to play back / (linguistics) to add okurigana / to pass the time / to see off a deceased person

To send