one man and his dog

as best one can

In the best possible way, given one's circumstances and abilities.

as far as one knows

To the best of one's knowledge, as far as someone knows or possible information to be gathered about the topic, subject, aspect, or situation.

back to square one

Located back at the start, as after a dead end or failure.

be a man

To put up with something or take responsibility for it; to deal with something, such as pain or misfortune, without complaining.

be one's own man

To behave independently without the influence of others.

be the bigger man

To walk away from a conflict to prevent it from escalating.

beat as one

To share the same feelings.

become one flesh

To join together in marriage; to develop a unifying bond as a result of marrying.