labor

1 labor (US) noun
or British labour /ˈleɪbɚ/
plural labors
1 labor (US)
noun
or British labour /ˈleɪbɚ/
plural labors
Britannica Dictionary definition of LABOR
1 
a  : physical or mental effort : work
[noncount]
[count]
◊ A labor of love is a task that you do for enjoyment rather than pay.
◊ When you enjoy the fruits of your labor/labors, you enjoy the things that you have gained by working.
b  [noncount] : work for which someone is paid
2 
[noncount]
a  : workers considered as a group
— often used before another noun
b  : the organizations or officials that represent groups of workers
3 
: the process by which a woman gives birth to a baby
[noncount]
[singular]
4 
Labour [singular] British, politics : the Labour Party of the United Kingdom or another part of the Commonwealth of Nations
2 labor /ˈleɪbɚ/ verb
(US) or British labour
labors; labored; laboring
2 labor
/ˈleɪbɚ/
verb
(US) or British labour
labors; labored; laboring
Britannica Dictionary definition of LABOR
[no object]
1 
a  : to do work
b  : to work hard in order to achieve something
2 
: to move or proceed with effort
3 
: to repeat or stress something too much or too often

labor under a delusion/misapprehension/misconception

◊ If you continue to believe something that is not true, you are laboring under a delusion/misapprehension/misconception.