The phrase "fixed expression" is correct and can be used in written English.
It refers to a phrase or saying that is commonly used and has a specific meaning that cannot be changed or altered. Example: "I couldn't understand the phrase 'to kick the bucket' until my English teacher explained that it was just a fixed expression for 'to die'."
Mr. Jones, with his smoothly shaved head and permanently fixed expression of amusement, has been an unmistakable dandy since the early '80s heyday of the Blitz nightclub.
Copyright only applies to fixed expressions, not to the ideas that may make up a fixed expression.
However, in the model with completely fixed expression, speciation probabilities were lower than in others.
Although many S/T-correlated genes exhibited fixed expression during the breeding process (Table 6), little improvement was observed for this trait (Table 4).
The President's upper body stuck rigidly out of a Red Flag limousine as he drove along Chang'an Avenue shouting "I salute you, comrades" to thousands of soldiers, their faces set in the same fixed expression of ardour and belief.
He surveyed his charges with a fixed expression you'd perhaps characterise as anticipatory indigestion.
Gestures go a long way toward compensating for the sculpted faces' fixed expressions.
He scorned a claim by George Osborne, the Conservative chancellor of the exchequer, that this year's budget "rewards work .This is a budget for millionaires not working families, cried Mr Miliband, urging ministers on the front bench opposite to raise their hands if they would benefit from the tax cut (cue fixed expressions and some squirming).
First, the majority of them are fixed expressions or idioms, as shown in (25) and (26).
Even though content-based publish-subscribe systems offer a reasonable level of flexibility and could be used to implement context-aware applications, they lack a very important feature — their predicates are fixed expressions that do not depend on the current context of the publisher or subscriber.
Whereas we uncovered an epigenetically fixed gene expression signature in melanoma cells attesting their transition through an episode of DNMT1 depletion, no similar gene expression signature was observed in other tumor types.
