to wait is a form of:

Plumbing



ជាទម្រង់ Gerund ឬ Present Participle នៃ plumb
ENGLISH MEANING
noun
1.
The art of casting and working in lead, and applying it to building purposes; especially, the business of furnishing, fitting, and repairing pipes for conducting water, sewage, etc.
2.
The lead or iron pipes, and other apparatus, used in conveying water, sewage, etc., in a building.