'cot' and 'camp bed' In American English, a cot is a narrow bed for an adult. It is made of canvas fitted over a frame, and you can fold it up. You take it with you when you go camping, or you use it as a spare bed at home. In British English, a bed like this is called a camp bed.
Across is a preposition. It describes the relationship between two persons, places, or things. It is sometimes used with the preposition from. Example: That house is across the street. Cross is most commonly a verb or noun. Crossed is the past tense or past participle of the verb to cross.
A preposition is a word that indicates location (in, near, beside) or some other relationship (about, after, besides) between a noun or pronoun and other parts of the sentence. A preposition isn't a preposition unless it goes with a related noun or pronoun, called the object of the preposition. Examples: Let's meet before noon. Before is a preposition; noon is its object. We've never met before. There is no object; before is an adverb modifying met. Rule 1.