1To cause something to float on water or in the air; to set something afloat (transitive).
子どもたちは公園の池にヨットのおもちゃを浮かべて遊んだ。
The children played by floating toy sailboats on the park pond.
お盆には灯籠を川に浮かべて先祖を送る風習がある。
During Obon, there's a custom of floating lanterns on the river to send off ancestors' spirits.
グラスに氷を浮かべて、冷たいドリンクを作った。
I made a cold drink by floating ice cubes in the glass.
池に花びらを浮かべて、庭を華やかに演出した。
We floated flower petals on the pond to give the garden a gorgeous touch.
2To show a smile, tears, surprise, or another emotional state on one's face (transitive).
彼はいたずらっぽい笑みを浮かべながら答えた。
He answered with a mischievous smile on his face.
その一言を聞いて、母は目に涙を浮かべた。
On hearing that one remark, my mother's eyes welled up with tears.
突然の質問に、彼は困惑の表情を浮かべた。
Faced with the sudden question, he showed a look of confusion.
3To bring an image, memory, or thought to mind; to imagine or recall (transitive).
目を閉じて、幼い頃の思い出を心に浮かべてみた。
I closed my eyes and tried to bring back memories from my childhood.
その曲を聴くと、いつも彼女の顔を思い浮かべる。
Whenever I hear that song, I always picture her face.
旅行の計画を立てながら、現地の景色をあれこれ浮かべた。
While planning the trip, I pictured various scenes of the local scenery.