下海

to go out to sea / to enter the sea (to swim etc) / (fig.) to take the plunge (e.g. leave a secure job, or enter prostitution etc)

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

surname Hai

ocean / sea / CL:個|个[ge4],片[pian4] / great number of people or things / (dialect) numerous

see 誇海口|夸海口[kua1 hai3 kou3]