HSK V7-9
Correct

老大

/ lǎodà /
Strokes

Definition

old age/very/eldest child in a family/leader of a group/boss/captain of a boat/leader of a criminal gang

Example

As an Adjective
old (in age)
1
Shǎoxiǎo
少小离
jiā
lǎo
老大
huí

leave home young and return old

As a Noun
eldest child in a family
2
Lǎo
老大
dāngbīng
当兵
  
,
lǎoèr
老二
jīngshāng
经商
  

The eldest child is an army man and the second eldest child is a businessman.

As a Noun
chief crewman of a boat; boatman
As a Noun
chief of a gang, etc
As a Noun
number one; leading figure or enterprise
As an Adverb
much; greatly; very