Hop aboard!

Answer:

GETON

Hint:

Think of what you might say to someone about to step onto a bus or train.

Explanation:

Hop aboard!" is a casual way to say "climb onto" a bus, train, or other transport. The answer "GETON" directly mirrors this meaning—it’s a simple two-word command ("get on") merged into one for crossword brevity. No wordplay here, just a straightforward phrase turned into a compact answer.

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