aboard
a- + board
https://gyazo.com/365fcaf63c79926526f242a942cea19c
source: [ドラゴンボールの筋斗雲が悟空とアラレちゃんを乗せているGIF画像｜無料GIF画像検索 GIFMAGAZINE 87213]
adverb & preposition
on or into (a ship, aircraft, train, or other vehicle):
(船･飛行機･列車･バスなどに)乗って; 船, 機, 車内に (!コーパス｟米｠ ではon boardより好まれる傾向がある)
e.g. as adverb : the plane crashed, killing all 158 people aboard
(組織･チームなどに)新しく加わって
e.g. figurative : he came aboard as IBM's new chairman
e.g. as preposition : climbing aboard the yacht.
on or onto (a horse):
e.g. as adverb : with Migliore aboard, he won the cup at a gallop.
Baseball on base as a runner:
〘野球〙 塁に出て
e.g. putting their first batter aboard.
PHRASES
all aboard!
a call warning passengers to get on a ship, train, or bus that is about to depart.
｟話｠ (まもなく出発しますので) «…行きに» 皆さまお早くご乗船, ご乗車ください «for» (!船･バス･列車などの乗客に対するお知らせ) .
ORIGIN
late Middle English: from a-2 (expressing motion) + board, reinforced by Old French à bord.