1A transfer between trains, buses, or other transportation — changing to a different line or vehicle to continue a journey.
新宿駅で中央線から山手線に乗り換えます。
I'll transfer from the Chuo Line to the Yamanote Line at Shinjuku Station.
終電に間に合うように、乗り換え時間を事前に調べておいた。
I checked the transfer times in advance so I wouldn't miss the last train.
この駅は多くの路線が交わっていて、乗り換えにとても便利だ。
Many lines meet at this station, making it very convenient for transfers.
2Switching from one ideology, party, system, or method to another.
彼はある日突然、支持政党を乗り換えた。
One day, he suddenly switched the political party he supported.
多くの企業が紙の管理台帳からクラウドサービスへの乗り換えを進めている。
Many companies are switching from paper-based ledgers to cloud services.
3In finance, selling a currently held stock or fund and buying a different one instead.
値下がりが続く銘柄から、成長が見込める株への乗り換えを検討している。
I'm considering switching from a stock that keeps falling to one with growth potential.
4In biology, chromosomal crossover — the exchange of segments between homologous chromosomes during meiosis.
減数分裂の過程で相同染色体の乗り換えが起こり、遺伝的多様性が生まれる。
During meiosis, crossover between homologous chromosomes occurs, creating genetic diversity.