To join or piece things together; to set or align bones (in medical context) — to connect broken or separate parts.
大工は板を接いで長い梁を作った。
The carpenter joined boards together to make a long beam.
転んで折れた骨を外科医が接いだ。
The surgeon set and joined the broken bone after the fall.
古い陶器の欠片を接いで修復した。
They restored the old pottery by joining together the fragments.
To graft (a branch or scion onto another plant) — used in horticulture (grafting).
春になったら果樹に品種の良い枝を接いでみよう。
In spring let's try grafting a superior scion onto the fruit tree.
接いだ枝がうまく根付くかどうかは時期が重要だ。
Whether the grafted branch takes depends heavily on the timing.
苗木に別の品種を接ぐことで性質を変えることができる。
By grafting another variety onto a seedling you can change its characteristics.