To row or paddle (a boat) using oars; to scull.
朝早くから友人と川をボートで漕いだ。
Early in the morning I rowed a boat on the river with my friend.
オールを一生懸命漕いで港へ向かった。
We rowed hard with the oars toward the harbor.
To pedal (a bicycle) — to push the pedals to move forward.
坂道を自転車でこぐのは大変だ。
Pedaling a bicycle up a hill is hard work.
彼は毎日学校まで自転車をこいでいる。
He pedals his bike to school every day.
To swing (on a swing), i.e., to pump one's legs/body to make a swing move.
子どもたちが公園でブランコをこいで遊んでいる。
Children are swinging on the swings at the park.
勢いよくブランコをこいで遠くまで飛んだ気分になった。
I pumped the swing hard and felt like I was flying far.
To operate a hand pump or similar device (to work a pump by pumping action).
井戸のポンプをこいで水を汲んだ。
I pumped the well to draw water.
古いポンプを何度もこいで空気を入れた。
I worked the old pump repeatedly to pump in air.
To push through something (like thick brush or deep snow); to make one's way by forcing through resistance.
深い雪を漕いで駅までたどり着いた。
I made my way through the deep snow and reached the station.
藪を漕いで進むのは大変だった。
It was hard work pushing through the thicket.