~を込める (put in / pour into)

The set verbal pattern ~を込める, literally 'to pack/load X in,' meaning 'to put X into [something],' 'to infuse with X,' 'to pour X in.' Common with emotions, effort, love, and meaning — 心を込める ('put one's heart into'), 愛情を込める ('put love into'), 力を込める ('put force into').