1. (verb) lengthen in time; cause to be or last longer

• draw out
• extend
• protract

2. (verb) lengthen or extend in duration or space

• keep up
• sustain

1. (verb) lengthen in time; cause to be or last longer

• lengthen

2. (verb) lengthen or extend in duration or space

• bear on
• carry on
• continue
• preserve
• uphold

1. (verb) lengthen in time; cause to be or last longer

• extend
• spin
• spin out
• temporise
• temporize

2. (verb) lengthen or extend in duration or space

• continue
• keep
• keep on
• retain

1. (verb) lengthen in time; cause to be or last longer

• continuation
• continuation
• lengthiness
• lengthiness
• prolongation
• prolongation
• protraction
• protraction
• extendable
• extendible
• extension
• lengthiness
• prolongation
• lengthening
• lengthening
• perpetuation
• perpetuation
• prolongation
• prolongation
• protraction
• protraction

2. (verb) lengthen or extend in duration or space

• continuation
• lengthiness
• prolongation
• protraction
• lengthening
• perpetuation
• prolongation
• protraction
• maintainer
• sustainer
• upholder
• maintenance
• sustainment
• sustenance
• sustentation
• upkeep
• sustainable