to blur the lines
Differences stop being so evident
To toe the line
To compromise and conform to what a group/person/the majority dictates
to cherry-pick something
to choose sth deliberately so that it suits our ideas/goals
to frown upon something
Sth is not socially or morally acceptable
to settle for
to be contented with/to make do with sth/sb
to be at loggerheads with sb
In conflict or strong disagreement with someone
to marry up
to look for a partner with higher status than one
to bark up the wrong tree
to make the wrong choice/follow the wrong strategy