noun:

• migrating bird (that is just passing through en route to its final destination)

expression / godan ~く verb:

• to bow (in great numbers) to a greater authority; to be drawn (en masse) to something attractive; even the plants yield [literal] - idiom

noun:

• (on) the way; (on) one's way; (en) route - usu. adverbially as 行きしなに ➜ 行きがけ

godan ~す verb / transitive:

• to crowd out; to push out; to squeeze out
• to start together; to set out en masse
• to highlight; to draw attention to