neかせるkaseru
1.

To assist someone, often a child, in falling asleep, usually by providing comfort or a calming environment.

2.

To lay down an object or person that is vertical into a horizontal position, such as moving a patient onto a bed.

3.

To refrain from utilizing or activating funds, goods, or resources, leaving them inactive for a period of time.

4.

To leave something, such as a product or substance, in a controlled environment for an extended duration to undergo processes like fermentation or maturation.

Example:

彼女は子供をそっと寝かせた。