It depends on the context. In the context of "a teardrop came from her eye", it is one word. In the context of "he watched the tear drop to the floor", it is two words.
In the context "this setup works great!", it is one word. In the context "I have to set up the table still", it is two words. In the context, "it was a set-up, I am innocent!", it is hyphenated.
In the context of "overall the service was good", it is one word. In the context of "he chose this one over all the rest", it is two words.
An estimate is one, particularly when there are facts or figures. Another word would be a hypothesis, and it is used more in a scientific context.
It can be either, depending on context. Birdbath, as an object, is one word, a bird taking a bath would be two words
The term "hardball" in the context of politics and strategy dates back to the late 20th century, notably popularized by political commentator Chris Matthews in his 1999 book "Hardball: How Politics Is Played, Told By One Who Knows The Game." However, the term itself has roots in baseball, referring to a more aggressive style of play. In a broader sense, the concept of hardball tactics in negotiations and competition has been present for much longer, reflecting a more combative approach to achieving goals.
People would use the word "revealing" in a present tense. For example, Austin, "I am revealing my greatest weakness." This would mean he is speaking in present tense.
It is one word, lunchtime (midday mealtime).
Used in the context "these landforms are ancient", it is one word. Used in the context "and because of this, the land forms around the lake", it is two words.
One Day at a Time - 1975 Hardball 7-20 was released on: USA: 4 April 1982
Depends on the context. In mathematics it would be translation. In sociology or ethnology, migration or nomadic. In employment, peripatetic.
A number of things. Supplying some context would help us guess which one you mean.